Getting visual aura right after waking up for 2 weeks. lasts 20 mins. and goes away. no headache. only after waking up. been on low-carb diet as well.

Migraine: This could be the beginnings of an atypical ophthalmic migraine. They are not necessarily accompanied by headaches and usually only involve eye symptoms.See your doctor and optometrist for evaluation of your eyesight and formal examination.

This is worrisome: It suggests that you might be having low glucose in the early morning because of your low carb diet. GIven all of your other conditions and concerns, you should probably keep an accurate food and symptom diary for a couple of weeks and make an appointment to see your provider. Also be sure to have a snack at bedtime (protein is best). Good luck!

Typical Aura : A specific migraine syndrome called Typical Aura Without Headache has been described in which an aura- most often visual- emerges not followed by headache but accompanied by numbness and/or tingling of the face or extremities. It would be helpful to know if you have a history of classic migraine headaches or a maternal lineage history. The onset of Aura on awakening is a typical migraine feature.